| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a ball screw capable of preventing occurrence of separation and the like on a nut-side ball screw groove and a ball returning passage. <P>SOLUTION: A ball load rolling passage 16 is formed between a screw shaft-side ball screw groove 12 and a nut-side ball screw groove 14, and the ball returning passage 18 formed in a ball circulating member 17 made out of a resin. A crowning treatment part 22 is formed by a treatment amount of approximately 0.1-1% of a diameter of a ball 15. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
